BELVIDERE — Jamie Page sobbed beside her attorney today in the Boone County Courthouse while state prosecutors played a recording of her 911 call to police dispatch.

She placed the call at 5:48 a.m. Feb. 2, 2013. Her boyfriend, Jacob Van Zant, had been wounded by a knife at her grandparents residence in the 200 block of Garden Drive in Belvidere.

“What the (expletive) did you do?” Page’s uncle, Edward Bernal, shouts at her in the recording.

Bernal told prosecutors he had been sleeping in the next room and woke to find Van Zant on the floor gasping for breath in the doorway of the couple’s bedroom.

Page, 21, is on trial this week for first-degree murder, a Class M felony that carries a prison sentence of 20 to 60 years. She was 19 at the time; Van Zant died two weeks before his 21st birthday.

In an opening statement to a jury of 12 women and two men, state prosecutor Victor Escarcida accused Page of killing Van Zant after an argument that started when she discovered that he deleted pictures of her ex-boyfriend from her Facebook account.

An autopsy determined that the wound in Van Zant’s chest was 2 inches deep and penetrated the lining of his heart, Escarcida said. Defense wounds were found on Van Zant’s left hand.

Page’s attorney, Paul Vella, called the death an accident and said Van Zant was wounded while trying to prevent Page from cutting herself, which Vella said she did to “relieve stress.”

Tim Blankenship was one of the first Belvidere police officers to arrive at the scene. He told prosecutors that he found a bloody scalpel in the bedroom, and clothes and other items looked as if they had been thrown around the room.

Page’s grandparents, Gloria and Esteban Bernal, said she did not come home after her shift at an unidentified bar on the night of Feb. 1. After calling her around 2 a.m. Feb. 2, Van Zant went with the grandparents to bring her home from “a friend’s apartment.”

On the day of the killing, Blankenship said, Page told him she had been at her ex-boyfriend’s apartment. And she was overheard admitting to another officer that she had been drinking but didn’t feel drunk.

Edward Bernal said he heard “banging” noises and yelling coming from the couple’s bedroom, like someone was “throwing things around,” and went to check on them.

Bernal said he knocked on their bedroom door and Van Zant answered. Van Zant explained that Page was angry because he had deleted pictures. Bernal said he told them to calm down and went back to his room for an unspecified amount of time before he heard “something fall” and found Van Zant wounded on the floor.